Calculate the volume of space between the two cylinders in the diagram . Use 3.14 for pi! Show work !

The area of a rectangle is 15+5y square feet. which of the following expressions could be the length of the sides of the rectangle, in feet a. 5 and 3y b. 5 and 3+y c. 5 and 5+y d. 3 and 5+3y

What are the solutions of the following system? y=-2x^2 y=x-2

Ineed with question three. i don't understand how i'm supposed to achieve 3 marks.